Someone unsuccessfully tried to attack #ethereum today by publishing a long (~550) blocks which contained invalid pow's. Only a small percentage of @nethermindeth nodes switched to this invalid chain. All other clients rejected the long sidechain as invalid
The chain has been overtaken in length by the good chain now, and should be overtaken in difficulty soon. Also looks like the attacker is not mining further on his published invalid chain. Another great demonstration of how client diversity makes #ethereum stronger.
The chain has been overtaken in difficulty now too, and all affected nodes reorged back to the good chain. No immediate attention required from node operators.
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